Applied anatomy and kinesiology, the mechanism of muscular movement . Fig. 86.—Claw-shaped hand resulting from paralysis of the Iumbricales and interosseicaused by an injury to the ulnar nerve. (Duehenne.) claw form is gradually lost and the posture of the normal restinghand resumed, as the small muscles gradually take on normal vigorand tone. Another condition that makes it impossible to close the hand orgrasp an object with fingers and thumb is paralysis of one or bothof the long flexors of the fingers. Fig. 87 shows the effect on theposture of the hand of paralysis of the middle half of the
Applied anatomy and kinesiology, the mechanism of muscular movement . Fig. 86.—Claw-shaped hand resulting from paralysis of the Iumbricales and interosseicaused by an injury to the ulnar nerve. (Duehenne.) claw form is gradually lost and the posture of the normal restinghand resumed, as the small muscles gradually take on normal vigorand tone. Another condition that makes it impossible to close the hand orgrasp an object with fingers and thumb is paralysis of one or bothof the long flexors of the fingers. Fig. 87 shows the effect on theposture of the hand of paralysis of the middle half of the flexor. Fig. 87.—Deformity of middle and ring fingers caused by paralysis of the middlehalf of the flexor sublimis digitorum. (Duehenne.) sublimis. Here it is the normal tension of the Iumbricales and inter-ossei that is unopposed, and the second phalanx is pulled into markedoverextension. If the paralysis affects the profundus, it is theterminal phalanx that is drawn out of normal position. THE PALM Alt INTEROSSEI 149 Another class of cases of paralysis of the hand is due to leadpoisoning. This affects the musculospiral nerve. The extensorcommunis is most often paralyzed; the extensors of the wrist lessoften. When the extensor communis is alone paralyzed the resting posi-tion of the hand is characterized by marked flexion of the firstphalanx, caused by the unbalanced tension of the lumbricales andinterossei. Flexion of the fingers is nearly normal, so that the ordi-nary uses of the hand to grasp and carry objects is not abolished asin paralysis of the flexors or the small muscles of the ha
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